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Specimen-electrode systems suitable for measurements at high stress are considered, and the stresses estimated for which they are suitable.Measurements at 50 c/s on mica, polystyrene and phenol formaldehyde up to stresses of the order of 106 V/cm, approximately equal to one-fifth of the intrinsic electric strengths, show that the changes of phase angle, if any, do not exceed 0.0005 With phenol formaldehyde an increase of capacitance of 2.5 parts in 1 000 was observed.
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A. E. W. Austen (1945) studied this question.
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